Sliver roll former



May 15, 1951 H. FRASER 2,553,038

SLIVER ROLL FORMER Filed Dec. 1, 1949 a Sheats-Sheet 1 1" g I \w' INVENTOF! ATTORNE May 15, 1951 H. FRASER SLIVER ROLL FORMER -s Sheets-Sheet 2 Filed Dec. 1, 1949 v mu:

May 15, 1951 H. FaAssn 2,553,038

S LIVER 'RQLL; FORMER Filed Dec. 1, 1949 3 Sheets- Shet 3 FIG. 5 FIG.5

INVENTOR f/z/yfi f/wser am wrm ATTORNE S Patented May 15, 1951 UNITED STATES PATENT OFFICE SLIVER ROLL FORMER Application December 1, 1949, Serial No. 130,451 In Great Britain March 21, 1949 4 Claims.

This invention relates to sliver-roll-forming machines having an endwise withdrawable arbor, or pair of half-arbors, on which the sliver is wound.

In prior roll-forming machines incorporating a withdrawable arbor, or pair of half-arbors, the arbor (or each half-arbor) has commonly been provided with protruding pins, usually each coplanar with the axis of the respective arbor or half-arbor, whether parallel to the axis or in clined thereto.

According to the present invention the pins or pin-like elements are orientated relatively to the axis of the respective arbor or half-arbor at a compound angle comprising an axial component and a circumferential component; that is, in effect, each pin or pin-like element is set helically, the axial component being directed towards that end of the arbor or half-arbor last to emerge from the roll on withdrawal.

The circumferential component of the rake of the pins is such that with a difference between the velocity of the material to be wound and the velocity of rotation of the pins the material will approach the points of the pins. Thus, if the pins are to move more rapidly than the material being delivered, they should be directed with the pointed ends leading circumferentially in the direction of rotation of the respective arbor or half-arbor. If the pins are to move at a less velocity than that of delivery of the material, the pins should be disposed with the pointed ends trailing.

If the roll former is so designed that the sliver falls by gravity on to the roll driver when it is not actually being wound to form a roll, the pins must of necessity engage with the sliver and lift it from the driver to commence the winding of a new roll.

Although for convenience of description we refer to the sliver-engaging elements as pins, it is to be understood that for individual pin-like elements there may be substituted helically disposed projecting parts of suitable formation.

If the arbor or half-arbors is or are frustoconical, the pins may be advantageously confined to that part of the arbor or the respective halfarbor near the end of larger diameter.

In the accompanying drawings:

Fig. 1 is a side elevation of part of a roll former of one type to which this invention has been applied.

The arm and the disc near to the viewer have been omitted for clarity, as also has. the cheek plate belonging to the arm shoulder.

Fig. 2 is a front elevation of the same-machine, the cheek plates being again omitted.

Figs. 3 and 4 are similar views of a roll former of another type to which the invention has been applied.

Figs. 5, 5A and 6 show different types of arbor in position on roll formers.

Figs. 7 and 8 are views corresponding to Figs. 1 and 2 showing the pins arranged with their pointed ends trailing.

In the arrangement shown in Figs. 1 and 2, the pins l on the half-arbors 2 point forwardly with respect to the direction of rotation, and are driven with a surface speed slightly in excess of the speed of travel of the sliver to the halfarbors by virtue of the discs 3 engaging frictionally with leather-covered driving rollers 4 fixed on a shaft 5 driven at a selected speed.

In the arrangement shown in Figs. 3 and 4, the half-arbors 2 are driven before commencement of the formation of the roll by frictional contact of their cylindrical portions with the surface of a driver 6. The abutment 8 is a fixture on the base of the machine. The sliver passing between the driver 6 and the half-arbors 2 is arrested by the abutment B, causing the necessary difierence in surface speed for the forwardly pointing pins l to dig into the sliver and commence winding a roll with complete certainty.

Fig. 5 illustrates how a serrated steel strip 9 may be fixed to and encircle a half-arbor 2 and present pin-like elements or spikes l 0.

Fig. 5A further shows that a pair of pin-carrying strips 9 with pins l0 may be fitted in spaced relation to a half-arbor 2 Fig. 6 illustrates the application of the invention to a roll former in which a single arbor 2 fitted with two sets of pins ll, I2, respectively, supports the centre of the roll until it is withdrawn endwise to one side to permit ejection of the completed roll.

It has been found that when using the arrangement shown in Figs. 1 and 2, with a difference of surface speed of 17% between the half-arbors and the sliver travelling thereto, satisfactory results are obtained when the pins are set at an angle of 15 from the axis of the respective half-arbor, and a circumferential angle of 30. Such pins are also satisfactory when using the abutment 8 indicated in Figs. 3 and 4.

As shown in Figs. '7 and 8, the pins l3 are so orientated that their pointed ends are trailing. With this arrangement, the rollers 4 may be so driven that the pins I3 are caused to move more 3 slowly than the sliver, and the sliver embeds itself on the pins and winding commences.

What is claimed is:

1. In a sliver-roll-forming machine having at least one withdrawable arbor member provided with protruding pin-like elements to engage the sliver, the feature that the pin-like elements are orientated relatively to the axis of the arbor member at a compound angle comprising an axial component and a circumferential component.

2. In a sliver-roll-forming machine embodying the feature claimed in claim 1, the disposition of the pin-like elements with their pointed. ends leading circumferentially in the direction of rotation of the arbor member.

3. In a sliver-roll-forming machine embodying the feature claimed in claim 1 in which the arbor member is of frusto-conical form, the further feature that the pin-like elements are confined to that part of the arbor member near the end of larger diameter.

4 4. In a sliver-roll-forming machine embodying the feature claimed in claim 1, the further feature that the pin-like elements constitute projecting parts of a serrated strip encircling the arbor member.

HUGH FRASER.

REFERENCES CITED The following references are 0Q record in the file of this patent:

UNITED STATES PATENTS 

